Rotor blade of a wind turbine and corresponding wind turbine

Abstract

A rotor blade for a wind turbine is provided. The rotor blade includes a high lift root profile with flat-back trailing edge with a suction side and a pressure side, a relative airfoil thickness being between 45% and 75% or between 48% and 70% of a chord length. A trailing edge thickness is between 30% and 75% or between 35% and 60% of the relative airfoil thickness. The chord position of the maximum relative airfoil thickness, which is measured from a leading edge towards the trailing edge, is between 35% and 45% or between 36% and 42% of the chord length. Also provided is a wind turbine equipped with the rotor blade(s).

The invention claimed is: 
     
       1. A rotor blade for a wind turbine, wherein the rotor blade comprises a high lift root profile with flat-back trailing edge with a suction side and a pressure side,
 wherein a relative airfoil thickness is between 45% and 75% or between 48% and 70% of a chord length, 
 wherein a trailing edge thickness is between 30% and 75% or between 35% and 60% of the relative airfoil thickness, 
 wherein a chord position of a maximum relative airfoil thickness, which is measured from a leading edge towards the trailing edge, is between 35% and 45% or between 36% and 42% of the chord length, and 
 wherein a curvature of the suction side has a first local maximum at a chord position between 0% and 5% of the chord length, a second local maximum of the curvature close to the maximum relative airfoil thickness position at 25% to 45% of the chord length, and a local minimum between the first and second local maxima, where the curvature is lower than 78% of a value of a local curvature maximum close to the maximum relative airfoil thickness position. 
 
     
     
       2. The rotor blade according to  claim 1 , wherein the geometry of the suction side is such that a suction peak of pressure distribution is located at a position of at least 30% of the chord length up to an angle of attack in degrees that is at least 35% of the relative airfoil thickness in percent of the chord length. 
     
     
       3. The rotor blade according to  claim 2 , wherein a vortex generator is placed at a location of the suction peak at the suction side. 
     
     
       4. A wind turbine, equipped with rotor blades having high lift root profiles with flat-back trailing edges with a suction side and a pressure side, wherein, for each of the rotor blades:
 a relative airfoil thickness is between 45% and 75 or between 48% and 70% of a chord length, 
 a trailing edge thickness is between 30% and 75 or between 35% and 60% of the relative airfoil thickness, 
 a chord position of a maximum relative airfoil thickness, which is measured from a leading edge towards the trailing edge, is between 35% and 45% or between 36% and 42% of the chord length, and 
 a curvature of the suction side has a first local maximum at a chord position between 0% and 5% of the chord length, a second local maximum of the curvature close to the maximum relative airfoil thickness position at 25% to 45% of the chord length, and a local minimum between the first and second local maxima, where the curvature is lower than 78% of a value of a local curvature maximum close to the maximum relative airfoil thickness position. 
 
     
     
       5. The wind turbine according to  claim 4 , wherein the geometry of the suction side is such that a suction peak of pressure distribution is located at a position of at least 30% of the chord length up to an angle of attack in degrees that is at least 35% of the relative airfoil thickness in percent of the chord length. 
     
     
       6. The wind turbine according to  claim 5 , wherein a vortex generator is placed at a location of the suction peak at the suction side.